Please forgive my ignorance, because I should really know the answer to this.
I fully believe in the doctrine of transubstantiation and that in the Holy Eucharist we receive the Body,Blood, Soul and Divinity of Jesus Christ. What makes me uncomfortable is the sacrifice part. Jesus asked us to ‘Do this in memory of Me’ and we do, and also I know that unless we eat His Body and drink His Blood we shall have no life in us. But why does this make it a sacrifice? I thought that Jesus’ sacrifice on the Cross for our redemption was a one-of-a-kind-once-only event, for example:
Unlike the Levite priests who had to offer sacrifices again and again, Jesus Christ is the only high priest who is “holy, blameless, pure, set apart from sinners, exalted above the heavens”. Paul explained that “unlike other high priests, He does not need to offer sacrifices day after day, first for his own sins, and then for the sins of the people. He sacrificed for their sins once for all when He offered Himself. For the law appoints as high priests men who are weak; but the oath, which came after the law, appointed the Son, who has been made perfect forever.” (Hebrews 7:26-28)“we have been made holy through the sacrifice of the body of Jesus Christ once for all.” (Hebrews 10:10)
With Jesus Christ’s sacrifice, God the Father said: “Their sins and lawless acts I will remember no more.” (Jeremiah 31:34)
Paul explained that once our sins are forgiven, “there is no longer any sacrifice for sin.” (Hebrews 10:18)
The sacrifice has been made once for all. No other sacrifice can or will be made. It is all-sufficient for all sin for all mankind forever, if we accept Jesus Christ as the Son of God.
Now all this I understand. What I don’t understand is why the Mass is a sacrifice, when Jesus has already made the one and only sacrifice.
Hebrews 10:12 But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God.
Hebrews 7:27 …this he did once, when he offered up himself.
Hebrews 9:28 …Christ was once offered to bear the sins of many…
Hebrews 10:10 By the which will we are sanctified through the offering of the body of Jesus Christ once for all.
Hebrews 10:14 For by** one offering** he hath perfected for ever them that are sanctified.
So why do we say that celebrating the Eucharist is a sacrifice?